JPS61224306A - Gapped core type reactor - Google Patents

Abstract

PURPOSE:To improve the occupation rate of a core by a method wherein the surface of the clamping plate arranged on the outside of the upper and the lower yoke cores is fastened tight using three or more clamping studs per core leg arranged at the prescribed positions on the inside and the outside of the inner and outer circumferences of the yoke cores. CONSTITUTION:The upper and the lower clamping plates 9 and 10 are arranged outside ring-shaped yoke cores 3 and 4. Three clamping studs 15, arranged at the position on the inside and outside of the inner and outer circumference of cores 3 and 4, are inserted into each core leg 2 located between the clamping plates 9 and 10, and they are fastened tight on the plates 9 and 10 using nuts 16a and 16b. According to this constitution, it is unnecessary to form a gap where clamping studs are passed through on the cores 3 and 4, and the manufacture and assembling such as a winding work, a measurement adjustment and the like can be inserted into the legs 2, the local heating on the clamping studs 15 themselves due to the flinging of magnetic flux is not generated, and there is no possibility of lowering of clamping strength due to heat expansion. Also, as it is unnecessary to form a hole for insertion of the studs 15 on the legs 2 and the cores 3 and 4, the center hole can be made small, and the occupation rate of the cores can be improved.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a gapped core reactor, and in particular, core legs are arranged triangularly, and a yoke core made of wound cores is placed above and below the core legs. This invention relates to improvements in the core tightening structure in the arranged structure.

[Technical Background of the Invention and its Problems] Conventionally, gapped iron core reactors have been generally used as reactors for shunt reactors and the like. This gapped core type reactor consists of a plurality of block cores formed by laminating silicon steel strips stacked together with a plurality of magnetic gaps in between to form core legs, and silicon steel strips above and below the core legs. A yoke core made of steel strip is placed,
It is constructed by winding a winding around the core leg. A gap member made of an insulator is generally interposed in the gap portion.

In the gapped core reactor configured in this manner, magnetic flux passing through the gap causes a magnetic attraction force to act between the cores above and below the gap, and the resulting vibrations generate noise. For this reason, it is necessary to firmly tighten the yoke core and the core legs integrally through the gap.

On the other hand, in recent years, there has been a strong demand for larger capacity and smaller equipment, and this type of reactor has three iron core legs arranged in a triangular position to reduce the installation space. ing.

FIGS. 3 and 4 show the configuration of a conventional triangular gapped iron core reactor. In this reactor, three core legs 2 are arranged in a triangular manner, each consisting of a plurality of radial core-shaped block cores 1 stacked with a magnetic gap 5 in between, each having silicon steel strips arranged radially and laminated. A winding 7 is wound around the core leg 2. A yoke core 3.4 made of a wound core is arranged above and below the core leg 2 to sandwich it.
Furthermore, upper and lower clamping plates 9.10 are arranged on the outside. A tightening stud 8 made of non-magnetic metal such as stainless steel is inserted into the center hole 1a formed in the center of each core leg 2, and the lower end 8b of this tightening stud 8 passes through the lower yoke core 4. The upper end portion 8 a extends through the upper yoke core 3 and the upper clamping plate 9 . Furthermore, the upper end 8a of the tightening stud 8
A retaining plate 11 is fixed to the retaining plate 11, and bolts 14 provided on the retaining plate 11 press the clamping plate 9 via the spring retaining plate 13 and the spring 12, and the core leg 2 and the yoke core 3.4 are integrally attached. It is tightened and fixed. However, with such a tightening structure, as shown in FIG. It takes a lot of effort and time to wind the wire and adjust its dimensions. In addition, the tightening stud 8 is
Since the tightening stud 8 itself is inserted through the holder, local heating may occur in the tightening stud 8 itself due to fringing of the magnetic flux, causing expansion, which may reduce the tightening force. In order to prevent this, the spring 12, the holding plate 11, etc. are required, which increases the number of parts and makes assembly difficult. Furthermore, there is a drawback that sufficient holes must be formed in the core leg 2 and the yoke core 3.degree.4 to allow the tightening stud 8 to pass through, which impairs the space factor of the core.

[Object of the Invention] In view of the above points, the present invention provides a gapped iron core that is easy to assemble and manufacture, improves the space factor of the iron core, and is more compact without impairing the clamping strength of the iron core. The purpose is to provide a shaped reactor.

[Summary of the Invention] The gapped core reactor of the present invention has clamping plates arranged on the outside of each of the ring-shaped yoke cores made of wound cores arranged above and below the core legs, and a yoke between the clamping plates. By tightening each core leg with three or more tightening studs placed inside the core, on the inside of the outer periphery, and on the outside of the core, there is no need to create gaps or holes in the core leg or yoke core for passing through the tightening studs. The iron core is characterized in that it is easy to manufacture and assemble, and the space factor of the iron core is improved.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Three core legs 2 formed by stacking a plurality of block cores 1 with magnetic gaps 5 interposed therebetween are arranged in a triangle, and a winding 7 is wound around each core leg 2. A ring-shaped yoke core 3゜4 made of a wound core is arranged above and below the core leg 2 so as to sandwich it, and upper and lower clamping plates 9 and 10 are further arranged outside the core leg 2. . This tightening plate 9゜1
Three tightening studs 15 are inserted into each core leg 2 between the yoke cores 3.4, and are inserted into the yoke core 3.4 and tightened by nuts 16a and 1ab, respectively. It is tightened to 9 and 10. This tightening stud 1
5 have sufficient mechanical strength and are made of non-magnetic metal such as stainless steel, and are arranged at approximately equal positions around each core leg 2.

With such a configuration, the tightening stud 15 and nut 16
By tightening between the upper and lower clamping plates 9 and 10 using a and 16b, the core leg 2 and the yoke core 3.4 are integrally tightened from above and below. Also, the tightening stud 15
are placed inside and outside the yoke core 3.4 of the yoke core 3.4, so there is no need to form a gap for the tightening stud to pass through the yoke core 3.4, which is made of a wound core, and winding work and dimensions are eliminated. Adjustment, manufacturing, and assembly are facilitated. Furthermore, since the tightening stud 15 does not pass through the core leg 2, there is no tightening due to fringing of magnetic flux, no local heating of the attached stud 15 itself, and there is no fear of a decrease in tightening force due to thermal expansion. Since it is not necessary to form a hole through which the tightening stud 15 is inserted in the iron core 1I12 or the yoke iron core 3.4, the center hole can be made as small as possible and the space factor of the iron core can be greatly improved.

[Effects of the Invention] As described above, according to the present invention, the fasteners and attachment plates arranged on the outside of the upper and lower yoke cores can be replaced with Since each core leg is tightened with three or more tightening studs, assembly and production are easy without compromising the core's clamping strength, and the space factor of the core is improved, making it more compact. An iron core reactor with a gap can be obtained.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a plan view showing a conventional gapped iron core reactor, Fig. 4 is a side view of the same, Fig. 5 is also an enlarged view of the main part. 1...Block core, 2...Core leg, 3.4...
Yoke iron core, 5... gap, 7... winding, 8.1
5... Tightening stud, 9, 10... Tightening plate, 16+
1,16b...Natsuto.

Claims (1)

[Claims] A core leg is formed by stacking a plurality of block cores through magnetic gaps, a winding is wound around this core leg, and three core legs configured in this way are arranged in a triangle. In a gap core type reactor in which a ring-shaped yoke core made of wound cores is disposed at the top and bottom, the top and
A tightening plate is arranged on the outside of each of the lower yoke cores, and the tightening interval is secured by three or more tightening studs of each core leg cylinder located inside the yoke core, inside the outer periphery, and outside the yoke core. An iron core type reactor with a gap, characterized in that the iron core legs and the yoke iron core are tightened by tightening them.